Compensator for a 6th Order System

I have a sixth order system with two complex dominant poles shown in the root locus plot attached. This is done using sisotool. I have requirements of 5% overshot and 1.5sec settling time which I have to satisfy. These are shown as border lines with yello shading on the root locus plots.

To satisfy the requirements, a compensator is needed to twist the locus out of the border while varying the proportional gain. I managed to get the two dominant poles out of the border by placing 2 complex zeros close to the origin but could not get near to the requirements.The pole closest to the origin is real and negative but it is inside the border with a zero very close to it. Will this pole effect me since it is real? If yes what is the best way to move it out of the border?